Fusion+pure sine wave UPS, inbuilt automatic voltage regulator+LCD smart display,low battery and overload protection, durable and also silent. It handles up to 4400w. It requires exactly four 12v deep cycle batteries (48 DC system) connected in cycle, zero changeover, immediate switchover time. Computers and routers will not reboot during a power outage. It also features a manual switch optimized for lead acid, tubular or SMF batteries to maximise lifespan